<!DOCTYPE html>
<!-- saved from url=(0058)https://online.pragmaticstudio.com/courses/elixir/steps/28 -->
<html lang="en-US" class="book"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  
  <title>The Pragmatic Studio Online | Developing with Elixir/OTP</title>
  <link rel="apple-touch-icon-precomposed" sizes="144x144" href="https://online.pragmaticstudio.com/favicons/apple-touch-icon-144x144.png">
  <link rel="apple-touch-icon-precomposed" sizes="152x152" href="https://online.pragmaticstudio.com/favicons/apple-touch-icon-152x152.png">
  <link rel="icon" type="image/png" href="https://online.pragmaticstudio.com/favicons/favicon-32x32.png" sizes="32x32">
  <link rel="icon" type="image/png" href="https://online.pragmaticstudio.com/favicons/favicon-16x16.png" sizes="16x16">
  <link rel="shortcut icon" href="https://online.pragmaticstudio.com/favicons/favicon.ico">
  <link rel="stylesheet" media="all" href="./14The Pragmatic Studio Online _ Developing with Elixir_OTP_files/application-cb185c07f9e7cf3071c019ec9ae89c92.css">
  <script async="" src="./14The Pragmatic Studio Online _ Developing with Elixir_OTP_files/analytics.js.завантаження"></script><script src="./14The Pragmatic Studio Online _ Developing with Elixir_OTP_files/application-dc521b896b294cf4648f0cd28001e154.js.завантаження"></script>
  
  <meta name="csrf-param" content="authenticity_token">
<meta name="csrf-token" content="hQ5e5Ed3S99CbjEszJjfezfMWZDOgoc0pqzT4yaFrdnuB3u2txsNFY/k3Qk2JvZ2gP60JMSr/vwPkCcjibKYwQ==">
    <script type="text/javascript">
  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

  ga('create', 'UA-59927351-1', 'auto');
  ga('send', 'pageview');
</script>

</head>
<body>
  <div id="header">
    <div id="logo">
      <a title="Pragmatic Studio Online" href="https://online.pragmaticstudio.com/"><img alt="Pragmatic Studio Online" title="Pragmatic Studio Online" src="./14The Pragmatic Studio Online _ Developing with Elixir_OTP_files/logo-a167560d29b6afb905c24a3432045f34.png"></a>
    </div>
    <div id="site_links">
      <ul>
        <li>
          <a href="https://pragmaticstudio.com/my_account">my courses</a>
        </li>
        <li>•</li>
        <li>
          <a href="https://online.pragmaticstudio.com/signout">sign out</a>
        </li>
      </ul>
    </div>
  </div>
  <div id="main_wrapper_1">
    <div id="main_wrapper_2">
      <div id="main_wrapper_3">
        <div id="main">
          <div id="content">
            

<h1>Recursion</h1>
<h2 class="subtitle">Notes</h2>

<h3>Exercise: Sum The Numbers</h3>
<p>
  Here's the <tt>recurse.ex</tt> file we ended up with in the 
  video:
</p>
<div class="highlight"><pre><span class="kd">defmodule</span> <span class="nc">Recurse</span> <span class="k">do</span>
  <span class="kd">def</span> <span class="n">loopy</span><span class="p">([</span><span class="n">head</span> <span class="p">|</span> <span class="n">tail</span><span class="p">])</span> <span class="k">do</span>
    <span class="nc">IO</span><span class="p">.</span><span class="n">puts</span> <span class="s2">"Head: </span><span class="si">#{</span><span class="n">head</span><span class="si">}</span><span class="s2"> Tail: </span><span class="si">#{</span><span class="n">inspect</span><span class="p">(</span><span class="n">tail</span><span class="p">)</span><span class="si">}</span><span class="s2">"</span>
    <span class="n">loopy</span><span class="p">(</span><span class="n">tail</span><span class="p">)</span>
  <span class="k">end</span>

  <span class="kd">def</span> <span class="n">loopy</span><span class="p">([]),</span> <span class="ss">do</span><span class="p">:</span> <span class="nc">IO</span><span class="p">.</span><span class="n">puts</span> <span class="s2">"Done!"</span>
<span class="k">end</span>

<span class="nc">Recurse</span><span class="p">.</span><span class="n">loopy</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">])</span>
</pre></div>
<p>
  Now that you know how to keep a bit of state each time through a 
  recursive "loop", rename <tt>loopy</tt> to <tt>sum</tt> and have it 
  sum the numbers in the list. For example, given the numbers 1 to 5 
  the termination clause should return 15.
</p>
        <div class="toggle-two">
          <ul>
            <li>
                      <p>
          <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
            <span class="title">Show Hint</span>
          </a>
        </p>
      <p style="display:none;">
        <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
          <span class="title">Hide Hint</span>
        </a>
      </p>

            </li>
            <li>
                      <p>
          <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
            <span class="title">Show Answer</span>
          </a>
        </p>
      <p style="display:none;">
        <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
          <span class="title">Hide Answer</span>
        </a>
      </p>

            </li>
          </ul>
          <div style="display:none;">
            <p class="hint">The <tt>sum</tt> function clauses need to take a second argument that
acts as an accumulator named, for example, <tt>total</tt>. Each time 
<tt>sum</tt> is called with <tt>[head | tail]</tt>, add the head to the current total and recurse with the new total. Return the final total when the termination clause runs.
Remember to initially
call <tt>sum</tt> with a value of 0.</p>
          </div>
          <div style="display:none; padding-top: 1em;">
            <div class="highlight"><pre><span class="n">defmodule</span> <span class="no">Recurse</span> <span class="k">do</span>
  <span class="k">def</span> <span class="nf">sum</span><span class="p">(</span><span class="o">[</span><span class="n">head</span> <span class="o">|</span> <span class="n">tail</span><span class="o">]</span><span class="p">,</span> <span class="n">total</span><span class="p">)</span> <span class="k">do</span>
    <span class="no">IO</span><span class="o">.</span><span class="n">puts</span> <span class="s2">"Total: </span><span class="si">#{</span><span class="n">total</span><span class="si">}</span><span class="s2"> Head: </span><span class="si">#{</span><span class="n">head</span><span class="si">}</span><span class="s2"> Tail: </span><span class="si">#{</span><span class="nb">inspect</span><span class="p">(</span><span class="n">tail</span><span class="p">)</span><span class="si">}</span><span class="s2">"</span>
    <span class="n">sum</span><span class="p">(</span><span class="n">tail</span><span class="p">,</span> <span class="n">total</span> <span class="o">+</span> <span class="n">head</span><span class="p">)</span>
  <span class="k">end</span>

  <span class="k">def</span> <span class="nf">sum</span><span class="p">(</span><span class="o">[]</span><span class="p">,</span> <span class="n">total</span><span class="p">),</span> <span class="k">do</span><span class="p">:</span> <span class="n">total</span>
<span class="k">end</span>

<span class="no">IO</span><span class="o">.</span><span class="n">puts</span> <span class="no">Recurse</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="o">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="o">]</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
</pre></div>
          </div>
        </div>


<h3>Exercise: Triple All The Numbers</h3>
<p>
  Write a <tt>triple</tt> function that takes a list of numbers and
  returns a <em>new list</em> consisting of each of the original numbers multiplied by 3.
  For example, if you call <tt>triple</tt> with a list of numbers 1 to 5 like so
</p>
<div class="highlight"><pre><span class="nc">IO</span><span class="p">.</span><span class="n">inspect</span> <span class="nc">Recurse</span><span class="p">.</span><span class="n">triple</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">])</span>
</pre></div>
<p>
then the result should be:
</p>
<div class="highlight"><pre><span class="p">[</span><span class="mi">3</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">9</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="mi">15</span><span class="p">]</span>
</pre></div>
<p></p>
        <div class="toggle-two">
          <ul>
            <li>
                      <p>
          <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
            <span class="title">Show Hint</span>
          </a>
        </p>
      <p style="display:none;">
        <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
          <span class="title">Hide Hint</span>
        </a>
      </p>

            </li>
            <li>
                      <p>
          <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
            <span class="title">Show Answer</span>
          </a>
        </p>
      <p style="display:none;">
        <a class="button show-hide" href="javascript:void(0)" rel="nofollow">
          <span class="title">Hide Answer</span>
        </a>
      </p>

            </li>
          </ul>
          <div style="display:none;">
            <p class="hint">The key is to remember that you can make a list using the 
<tt>[head | tail]</tt> syntax. For example, the literal
<tt>[1 | [2 | [3 | []]]]</tt> makes the list <tt>[1, 2, 3]</tt>. So... each time 
<tt>triple</tt> is called with <tt>[head | tail]</tt>, make a new list where the head is the original head multiplied by 3 and the tail is the result of recursively calling <tt>triple</tt> with the original tail. When
<tt>triple</tt> is called with <tt>[]</tt> (the terminal clause),
return an empty list. In other words, you'll end up recursively creating
 the list as a series of heads and tails <tt>[3 | [6 | [9 | [12 | [15 | []]]]]]</tt> which evaluates to <tt>[3, 6, 9, 12, 15]</tt>.</p>
          </div>
          <div style="display:none; padding-top: 1em;">
            <div class="highlight"><pre><span class="n">defmodule</span> <span class="no">Recurse</span> <span class="k">do</span>
  <span class="k">def</span> <span class="nf">triple</span><span class="p">(</span><span class="o">[</span><span class="n">head</span><span class="o">|</span><span class="n">tail</span><span class="o">]</span><span class="p">)</span> <span class="k">do</span>
    <span class="o">[</span><span class="n">head</span><span class="o">*</span><span class="mi">3</span> <span class="o">|</span> <span class="n">triple</span><span class="p">(</span><span class="n">tail</span><span class="p">)</span><span class="o">]</span>
  <span class="k">end</span>

  <span class="k">def</span> <span class="nf">triple</span><span class="p">(</span><span class="o">[]</span><span class="p">),</span> <span class="k">do</span><span class="p">:</span> <span class="o">[]</span>
<span class="k">end</span>

<span class="no">IO</span><span class="o">.</span><span class="n">inspect</span> <span class="no">Recurse</span><span class="o">.</span><span class="n">triple</span><span class="p">(</span><span class="o">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="o">]</span><span class="p">)</span>
</pre></div>
          </div>
        </div>


<h3>Code So Far</h3>
<p>
  The code for this video is in the
<code>recursion</code> directory found within the
  <tt>video-code</tt> directory of the <a href="https://s3.amazonaws.com/pragmaticstudio/courses/elixir/pragstudio-elixir-code.zip">code bundle</a>.
</p>



<div class="chapter_navigation bottom">
  
    <a class="multi-line-button green" href="https://online.pragmaticstudio.com/courses/elixir/steps/704/achievements" data-method="post" rel="nofollow" style="width:16em">
      <span class="title">Go To Next Video</span>
      <span class="subtitle">and mark this step complete!</span>
    </a>
    
</div>



  




            <div id="footer">
              <p>
  All course material, including videos, slides, and source code, is copyrighted and licensed for
  <em>individual use only</em>. You may make copies for your own personal use (e.g. on your laptop, on your
  iPad, on your backup drive). However, you may not transfer ownership or share the material with other
  people. We make no guarantees that the source code is fit for any purpose. Course material may not be
  used to create training material, courses, books, and the like. Please support us and our instructors by
  encouraging others to purchase their own copies. Thank you!
</p>

              <p>
                Copyright © 2005–2018, The Pragmatic Studio.
                All Rights Reserved.
              </p>
            </div>
          </div>
          <div id="sidebar">
            <div class="course_head">
  <h3>Developing with Elixir/OTP</h3>
  <h4 class="subtitle"></h4>
</div>
<div class="progress">
  <div class="meter">
    <div class="meter_progress" style="width: 0%"></div>
  </div>
  <div class="meter_label">
    0% complete
  </div>
  <div class="meter_reset">
    
  </div>
</div>
<div class="navigation">
  <ul>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/1">1. Introduction</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/1">Video</a><span class="time">1:56</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/2">Setup</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/2">2. Create Mix Project</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/3">Video</a><span class="time">8:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/4">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/3">3. High-Level Transformations</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/5">Video</a><span class="time">8:27</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/6">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/4">4. Parse Request Line</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/7">Video</a><span class="time">10:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/8">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/5">5. Route and Response</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/9">Video</a><span class="time">6:40</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/10">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/6">6. Function Clauses</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/11">Video</a><span class="time">6:28</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/12">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/7">7. Request Params and Status Codes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/13">Video</a><span class="time">8:45</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/14">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/8">8. Rewrite Paths and Track 404s</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/15">Video</a><span class="time">9:31</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/16">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/9">9. Serve Static Files</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/17">Video</a><span class="time">11:27</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/18">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/10">10. Module Attributes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/19">Video</a><span class="time">3:00</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/20">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/11">11. Organizing Code</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/21">Video</a><span class="time">6:30</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/22">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/12">12. Modeling With Structs</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/23">Video</a><span class="time">11:09</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/24">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/13">13. Handle POST Requests</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/25">Video</a><span class="time">10:32</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/26">Notes</a></li>
        </ul>
      </li>
      <li class="expanded">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/14">14. Recursion</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/27">Video</a><span class="time">13:17</span></li>
            <li class="here"><a href="https://online.pragmaticstudio.com/courses/elixir/steps/28">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/15">15. Slicing and Dicing with Enum</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/29">Video: Part 1</a><span class="time">10:25</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/30">Video: Part 2</a><span class="time">11:51</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/31">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/16">16. Comprehensions</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/32">Video</a><span class="time">11:15</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/33">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/17">17. A Peek At Phoenix</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/34">Video</a><span class="time">13:12</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/35">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/18">18. Test Automation</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/36">Video</a><span class="time">15:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/37">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/19">19. Rendering JSON</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/38">Video</a><span class="time">06:47</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/39">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/20">20. Web Server Sockets</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/40">Video</a><span class="time">19:11</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/41">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/21">21. Concurrent, Isolated Processes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/42">Video: Part 1</a><span class="time">12:07</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/43">Video: Part 2</a><span class="time">10:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/44">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/22">22. Sending and Receiving Messages</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/45">Video</a><span class="time">19:38</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/46">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/23">23. Asynchronous Tasks</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/47">Video</a><span class="time">20:19</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/48">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/24">24. Stateful Server Processes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/49">Video: Part 1</a><span class="time">8:09</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/50">Video: Part 2</a><span class="time">11:55</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/51">Video: Part 3</a><span class="time">9:49</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/52">Video: Part 4</a><span class="time">8:59</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/53">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/25">25. Refactoring Toward GenServer</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/54">Video</a><span class="time">21:12</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/55">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/26">26. OTP GenServer</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/56">Video</a><span class="time">16:57</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/57">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/27">27. Another GenServer</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/58">Video</a><span class="time">9:00</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/59">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/28">28. Linking Processes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/60">Video</a><span class="time">13:38</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/61">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/29">29. Fault Recovery with OTP Supervisors</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/62">Video: Part 1</a><span class="time">13:39</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/63">Video: Part 2</a><span class="time">6:13</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/64">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/30">30. Final OTP Application</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/65">Video</a><span class="time">15:22</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/66">Notes</a></li>
            <li class="not-completable"><a href="https://online.pragmaticstudio.com/courses/elixir/next_steps">Next Steps</a></li>
            <li class="not-completable"><a href="https://online.pragmaticstudio.com/courses/elixir/evaluation">Evaluation</a></li>
        </ul>
      </li>
  </ul>
</div>


          </div>
        </div>
      </div>
    </div>
  </div>


<script id="wappalyzer" src="chrome-extension://gppongmhjkpfnbhagpmjfkannfbllamg/js/inject.js"></script></body></html>